The stem extender has been fabricated from some 1 1/8" Reynolds 531 steel tube. Inside the fork is an Aheadset quill adaptor with an internal quill wedge. Inside the extender tube is a 25.4-27.2mm shim so that the extender tube fits to the quill adaptor perfectly. The lower clamp fixes the extender to the top of the fork. The upper clamp secures it to the top of the quill adapter. This 'belt and braces' method is the stiffest and strongest way to mount an Ahead stem to a Dawes Kingpin. The carbon spacers are cosmetic, and serve no structural purpose. The headset is a standard threaded Shimano 105 item, but the top nut has been reduced in height by 4mm. I also shortened the head tube by 6mm, thus allowing the lower clamp to align with the fork steerer's clamping slot. Safety first!